[konsole] [Bug 425707] New: Unexpected Konsole mouse cursor position change when changing cursor shape

[oldherl]

https://bugs.kde.org/show_bug.cgi?id=425707

            Bug ID: 425707
           Summary: Unexpected Konsole mouse cursor position change when
                    changing cursor shape
           Product: konsole
           Version: 20.04.3
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: emulation
          Assignee: konsole-devel at kde.org
          Reporter: oldherl at gmail.com
  Target Milestone: ---

Created attachment 131123
  --> https://bugs.kde.org/attachment.cgi?id=131123&action=edit
Video clip showing the bug, konsole 20.04.3 on Arch Linux

SUMMARY
In Konsole, when changing from mouse-tracking application (e.g. mouse-enabled
tmux or vim) to default (e.g. exiting tmux), the mouse cursor moves
unexpectedly. 

STEPS TO REPRODUCE
1. Open a Konsole window and run a mouse-enabled tmux in it.
2. Type "exit" but no Enter key
3. Move the mouse cursor to the end of PS1
4. Press Enter to exit tmux.

OBSERVED RESULT

Unexpected mouse position change. The cursor is not in the same place as before
the Enter key. In my video it jumps up for almost one character height.

See the video clip "konsolebug".

EXPECTED RESULT

Only the shape would change from Arrow (application mouse tracking mode) to
I-Beam (default), but the position should not change.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Arch Linux
(available in About System)
KDE Plasma Version: 20.04.3
KDE Frameworks Version: 5.72.0
Qt Version: 5.15.0

ADDITIONAL INFORMATION

I can reproduce it on git `master` branch of konsole and the same version for
all other libraries.
I cloned the konsole source code from git and did a bit of debugging. Seems
that it's caused by `KCursor::setAutoHideCursor`. I removed that line so that
the cursor won't auto-hide on key strokes, and the bug disappears. Hope that
helps.
I recorded in "konsolenobug" video.

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